Blow Molding
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Severe parison sag in EAA extrusion '2079851475616104457
Problem Phenomenon
The parison sag of EAA extrusion '2079851475616104457 is 20-40mm, resulting in a bottle bottom wall thickness of only 0.3-0.4mm
Cause Analysis
EAA melt strength is low, the parison stretches and thins under gravity; slow parison extrusion speed increases sag time; high parison temperature and low viscosity aggravate sag
Solution
1) Add 0.3-0.5wt% micro-crosslinking agent to increase melt strength; 2) Increase the parison extrusion speed to shorten sag time; 3) Lower the parison temperature by 10-15°C to increase viscosity; 4) Use a wall thickness controller to compensate for sag
Key Takeaway
Parison sag is caused by low melt strength; micro-crosslinking and wall thickness control are the key
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